Updated openstack/openstack
Project: openstack/cinder  0fb250bff8ac278a27979815aa1c4885f4f37af4

Remove Mock class monkey patching

Replace use of Mock with Mock(). The Mock class was being modified and
so affecting other tests where Mock is used. An instance of the Mock
class is now used to keep the tests isolated.

Change-Id: Iccab8430d5814258c8c2d1f9af015bce999549bc
Closes-Bug: #1286245